Question about 1987 Volvo 240

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Defrost is not working. Volvo 1989 sw240

The vents blow warm air on the main panel and floor, but not the defrost to heat the windshield, nothing blows out of the vents. When I close all the vents and push in the defrost button, nothing happens. The windshield keeps fogging up and gets ice on the inside of it. Can't see while driving, what should I do?

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  • Dana Rudd Feb 14, 2009

    I have a 1987 240DL with the same problem; air will not come out through the defroster.

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  • Master
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You have a problem with the vacuum operation of the dampers that control the direction of the airflow. You will need to pull the front panel of the console and look at the vacuum hoses that attach to the back of the control buttons. If those are attached, look under the dash to see if they are attached to the small bellows that control the dampers. You should pull the glove box out so you can see the damper under the dash to get a look at it and get an idea for how the other one looks. There is a second damper to the left of the one behind the glove box. Behind the bellows there is a small nipple that any loose hoses should be attached to. Take a flashlight along when you start exploring. If those are okay, check the other side.

Posted on Jan 28, 2009

  • 240cpa Feb 14, 2009

    When you push the defrost button on the lower panel, have the fan off. As the button for defrost is pushed you should hear some noise from under the dash as the vacuum opens the dampers and opens the vent to let air flow out the top of the dash. On these older cars the sound is not loud but is noticeable if the vacuum and dampers are working. If you don't hear that sound, pull the glove box as I described previously on this item and look for a quarter inch hose that may have come off the actuator nipple. If you hear the noise and the amount of air blowing is only a small amount, push more air up by closing the vents facing the passenger cabin.

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